Transmission brake



sept. 1, 1925. 1,552,226

H. NEWELL TRANSMISSION .BRKE

/Original Filed Jan. 23. 1924 /A/l/E/vro Hkaser /Vc WELL and the State of Patented Sept. l, 1925.

HERBERT NEWELL, or PORTLAND, OREGON. TRANSMISSION BRAKE.

Application ledf'January 23, 1.924, Serial No. 687,978. Renewed To all whom t may concern:

Be it known that I, HERBERT NEWELL, a citizen of the United States, and a resident of Portland, in the county of Multnomah Oregon, and having his address a-t 1622 5th Avenue southwest, in said city and State, have invented a new and usefu Improvement in a Transmission Brake, th

-of which the following is a specification.

y invention relates to transmission brakes for use on reduction gears for ship propulsion, machine tool drives, automotive transmission, locomotive brakes and in fact wherever reduction in speeds is required or a stopping and starting 1s necessary or heavy loads are to be stopped at intervals whether the same be of a sudden nature or quick stops are to be made, and my invention is of a simple nature, substantial of construction, made of the fewest parts and consists of well known principles of construction and utilizes 'material of a liquid nature and I may utilize such liquids as oil or the like that will give the least friction and weary in its use and will at the same time afford the greatest amount of positive lubrication while under pressure.

n The invention primarily consists of a transmission shaft having collars on either end and mounted upon a base frame within bearings and having a reduction member attached thereto engaging one or more reduction transmission members engaging the same secured to a crank shaft to which are attached piston rods and a piston operating within a cylinder and a bypass across which passes a valve shaft and a passage way therethrough and an operating lever for controling the operation of the same by manual or other means.`

To make my invention flexible and have ease and safety of operation I have here shown four pistons iand cylinders Set opposite each other and balanced as to diameter, i stroke, and number; two on either side but I do not wish to be limited to any number of pistons and cylinder for it will be obvious that for greater loads and high speeds it may require a larger number of these pistons 'and cylinders to afford flexibility to the July 1e, 1925.

transmission whereas chinea smaller number shown but one passageway through the valve, and in this do not wlsh to be limited as 1n practice more than one opening may be found to be essential. To prevent the sud'- den stopping of the transmission brake and e consequent shock that will follow I have provided a fiexible control on the lever wherein if the control lever is forcibly and quickly thrown over the valve lwill take a short period of time in closing.

for slo'vvT acting mamay be used. I have For a better and more complete description of my inv'ention reference is had to the vaccompanying drawings, in which- Fig. 1 1s an end and partial section view of my assembled device `showing the detailed construction of the same, Fig. 2 is a plan and partial section view of the same, Fig. 3 is a side view of the exterior of the assembled device, Fig. 4 is an enlarged and partial section view of the controll lever and Fig. 5 is a detailed section view of the flexible control feature of the operating lever.- y

Like reference characters refer to like parts throughout the several views.

l is the transmission shaft that runs transversely of the transmission case and has a transmission member 2 attached thereto and having collars or flanges 3 and 4 attached thereto, one on the driven end and the other on the driving end, these collars or flanges are arranged for attachment to like members to be attached thereto and may be so made vas to meet the requirements of the different character 'of work for which they are intended to be used for a iexiblel coupling ma be interposed at this point to permit` ofy a certain flexibility between this connection and the member t0 be attached thereto. 5 and 6 are transmission members arranged to engagement with the member 2. 7 isa crank shaft held in alignment by the bearings 8 and 9 arldmaife'covered by the case or housing 10 that is secured to the frame 1l by fastening bolts 12 and it is highly desirable that a close fit be made between these two members for the fluid to be used as the brakin medium will be made to fill the voids in t is spge to act as a seal jpose of making a close working tit between ving 4, the valve abruptly,

` cooling for if the the cylinder and the pistons. Piston rods 14a are made to connect the pistons with the crank rods, l5 is a housing that is made to closely connect with the frame and to prevent leakage and 16 is a passage way that connects through a valve to; like passage ways and cylinders on the opposite side of the case and the same being of like size and number makes a balanced mechanism. 17 is a valve shaft having one ormore passage ways 18 therethroughl in the passage way 16 and is held in place in the bearing 19 the stem of the valve 17 passes through the stuing box 20 having take up bolts 20a and passes to the outside as shown at 21 in Fig. 3, to this valve stem 21 an operating lever 22 is attached whiehis for the direct purpose of rotating the valve to restrict the opening,

i through which the operating and controlling liquids are to be pumped.- 22a are fins on the outside of the casting for the purpose of liquids are forced through a restricted opening for a long period considerable heat may be developed. A connecting rod 23 is attached to the lever 22 by means of a pin or bolt .on its one end and on its other end it is attached to a bell crank 29 being journaled `about pin 30. The connectrod 31 is attached to the other end of the bell crank and is connected directly to a :toot lever. This lever system as described is intended for automotive controls, but for other and di'erent uses a different method may be employed and l do not, therefore wish to be limited in my claims to this method of lever control. To adord a flexibility to the control andv to prevent the positive shutting o, or the positive closing of I have attached a 'cylinder and dash pot arrangement to prevent the abrupt and positive closing of the valve in which spring 25 is attached on its one lever 22, the

` tac'hed to the lever end to the case, and at the other end to the rod 23 has a slot 23a and the tension of the spring tends to hold the same in the position as shown in Fig. 4:, also at- 22 is a piston rod 27 having a piston operating therewith within the cylinder 26 which is also attached to 'the case, this cylinder liquids and the piston has an opening through which the liquid is permitted to pass when the piston is operated. When pressure is applied in the direction indicated by the arrow in Fig. 4 the rod 23 moves along the pin 24 at which time the spring 25 is iilled with oil or other incasso is directly applied to the operating lever and the same is actuated by the action of the spring and the speed of closing is dependent upon the rapidity of the flow of the liquid within the cylinder through the oritice of the piston therein. 33 and 311 are coverings over theends ofthe housing and cover the openings in the valve 17 pass and there is more or less leakage of oil past these bearings. To prevent the waste of this oil and to insure its return to the oil supply within the sump within casing 10 overflow return `pipes 32 are provided that connect the space for overflow-and the casing 10.

Having thus described my invention I pish to make the following claims there- .01.*

1. A transmission brake comprising a collared transmission shaft, a base frame adapted to having the transmission shaft journaled therein, a pinion secured to the shaft, gears coactingwith .the pinion said gears secured to crank shafts, bearings for the crank shafts, connecting rods and pistons adapted to being operated by the crank shafts, cylinders within the base frame having the pistons coacting therein, a valve and controllinglevers adapted to have liquids pumped through the valve and rotation the case through which means to restrict the size of the passage v through the valve and housing means attherein under pressure.

A transmission brake comprising a base frame, having cylinders adapted to the operating of pistons as pumps therein, liquid maintaining reservoirs disposed upon either side of the base frame-and adapted to the supplying of liquid to the cylinders at the inlet and outlet ends, a transmission shaft and pinion journaled within the housing upon the base frame, gears adapted to being driven by the pinion and secured to crank shafts also mounted in bearings upon the hase frame, pistons and piston rods adapted to operating as pumps within cylinders, a valve disposed between the cylinders adapted to being operated from the eX- terior of the base frame and the liquid maintaining reservoirs.

31 A transmission brake comprising liquid reservoirs, pumping means adjacent the reservoirs adapted to maintaining pressure in the liquid, a transmission shaft attached to the pumping means through gearinga valve disposed in the channel of the pumped liquid adapted to being regulated, as to the opening through. which the liquid is to be pumped, from the exterior and means for attaching prime movers to the .transmissionshaft.

li. A transmission brake comprising a transmission shaft having anged ends and a pinion mounted thereupon and journaledupon a'frame, gears coctin to operate der pressure, liquid maintainin 5 adapted to m a channel adapted to having liqu therethrou gh under pressure an s and reservoirs aintain liquids un er pressure,

idsl pumped d having a valve disposed across the channel adapted to being regulated from the exterior by control levers adapted' to the closing of the valve at a predetermmed rate and piped means for returning leaked liquids to the liquid containing reservoirs.

HERBERT NEWELL. 

